* vm_core.h: use __attribute__((unused)) in UNINTIALIZED_VAR on clang

4.0+ instead of just on 4.2. Clang has supported the unused attribute
  since before version 4, so this should be safe.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Oct  1 23:44:00 2013  Charlie Somerville  <charliesome@ruby-lang.org>
+
+	* vm_core.h: use __attribute__((unused)) in UNINTIALIZED_VAR on clang
+	  4.0+ instead of just on 4.2. Clang has supported the unused attribute
+	  since before version 4, so this should be safe.
+
 Tue Oct  1 22:03:48 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/tempfile.rb (Tempfile#unlink): finalizer is no longer needed

vm_core.h

@@ -109,7 +109,7 @@
 #define UNLIKELY(x) (x)
 #endif /* __GNUC__ >= 3 */
 
-#if (defined(__clang__) && (__clang_major__ == 4 && __clang_minor__ == 2))
+#if (defined(__clang__) && __clang_major__ >= 4)
 #define UNINITIALIZED_VAR(x) x __attribute__((unused))
 #elif defined(__GNUC__) && __GNUC__ >= 3
 #define UNINITIALIZED_VAR(x) x = x